Hello, the name Blankenburg often comes in Brandenburg before. It is also correct that it a noble family "von Blankenburg" gave that had Strelitz properties in the Uckermark and the Mecklenburg. They have some references, from where theirs families Blankenburg come would be able be. My wife has this name in the ancestor line in the Barnim, that directly at the Uckermark in the south border. Me emigrants are also confessed to the USA. From the fact have I might unite recordings to this family. greeting from germany Peter Woddow